There are two blowers. One is the fresh air blower and it sits just ahead of the dash. It is controlled by the uppper right dash control, and only blows in outside fresh air. It can be directed to either the defrost, center vents, or the floor.
The second blower is the aux heater blower, and it is in the engine compartment to the drivers side of the engine. It supplements the air that gets blown through the heat exchangers by the engine cooling fan. It comes on when you lift the heater levers between the seats. Heated air can be directed to either the defrosters or to the footwell openings, by using the dash controls.
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Bill Krause
'79 911SC Euro
MY PELICAN GALLERY